Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 270, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118859
Keywords
Dry reforming of methane; Cobalt catalyst; Catalyst deactivation; Reaction kinetics; DFT
Funding
- National Natural Science Foundation of China [91745102, 21950410522]
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Cobalt shows high catalytic activity for the important dry reforming of methane (DRM) reaction. However, it is prone to deactivation and the corresponding mechanism remains controversial. In this work, we combined density functional theory calculations and microkinetic modeling to study the active site and reaction mechanism of Co catalyzed DRM reaction, employing face centered cubic Co(111) and Co(211) as models. It was found that the step site over Co(211) is the active site for the reaction, and on Co(111), the C+O and CH+O paths are the preferred reaction pathways, while the C+O path is dominant on Co(211). The dissociation of CH4 is the rate-controlling step of DRM over both Co(111) and Co(211). We found that Co(111) is mainly deactivated due to carbon deposition whilst Co(211) undergoes surface oxidization. In addition, Co(111) tends to follow the surface carbon coupling mechanism, and surface carbon clusters formed will lead to catalyst deactivation.
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